Functional description 731
•Four-wire E and M signaling type I and II, two-waydial repeating (ESN
and Non-ESN)
— echo suppression for type I
— Switchable seven dB and 16 dB for carrier interface for ESN
applications
— Transmitand receive of voice through two separate paths
•TypeI signaling through E and M leads
— TypeII signaling
– Near-end seizure with MA/MB leads
– Far-end detection with EA/EB leads
•Paging trunk loop OAID operation
— Support access by low resistance path at the PA/PBlead.
— All call zone paging is not supported.
•Twoto four-wire conversion of the transmission path
Trunk unit functions
The functions provided by each unit on the E and M Trunkcard include
2-wire signaling, 4-wire signaling, and paging operation as follows:
•2-wire, E and M TypeI signaling (see Figure 228 "E and M TypeI
signaling" (page 732)) with:
— near-end seizure and outpulsing with M lead
— ground detection with E lead
— voice transmission through tip and ring for transmit and receive
•4-wire, E and M TypeI and II signaling (see Figure 229 "E and M Type II
signaling" (page 732)), 2-way dial repeating with:
— echo suppression for TypeI signaling
— switchable 7 dB and 16 dB pads for carrier interface
— voice transmission and reception through two separate paths
— TypeI signaling through E and M leads
— TypeII signaling with near-end seizure by SB/M leads and far-end
detection by E/SG lead
•4-wire, DX signaling (see Figure 230 "4-wire DX signaling" (page 734))
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.